Paying for a not is no guarantee, you can only go by other people's experiences and not just assumptions.
They will spend longer telling you about the type of oil they claim to use than actually doing the service. Then charge you extra to dispose of your old oil if you believe they even changed it in the first place. And the MOT will require new brakes or exhaust or tyres etc etc.
I just told you what the standard of work is. Rear tires should have been 34 PSI but inflated to 44psi. You want to let them service your car?
I don't know what the standard of work is like, but if it's ok then this is an absolute bargain at this price. Voted hot.
Go to a no pass no fee MOT place, there's one in Canning Town E13